Drum stop mechanism for rotary duplicating machines



July 14, 1953 c. A. LEVIN 2,645,174

DRUM STOP MECHANISM FOR ROTARY DUPLICATING MACHINES Filed Aug. 4, 1949 ll Sheets-Sheet l c. A. LEVIN 2,645,174

DRUM STOP MECHANISM FOR ROTARY DUPLICATING MACHINES July 14, 1953 ll Sheets-Sheet 2 M. 0 1 a m J m C. A. LEVIN July 14, 1953 DRUM STOP MECHANISM FOR ROTARY DUPLICATING MACHINES Filed Aug. 4. 1949 y 4, 1953 c. A. LEVIN 2,645,174

DRUM STOP MECHANISM FOR ROTARY DUPLICATING MACHINES July 14, 1953 c. A. LEVIN 2,545,174

DRUM STOP MECHANISM FOR ROTARY DUPLICATING MACHINES Filed Aug. 4, 1949 ll Sheets-Sheet 5 N s N w z y 4, 1953 c. A. LEVIN 2,645,174

DRUM STOP MECHANISM FOR ROTARY DUPLICATING MACHINES ZW*%QZZZ y 4 1953 c. A. LEVIN 2,645,174

DRUM STOP MECHANISM FOR ROTARY DUPLICATING MACHINES Filed Aug. 4, 1949 ll Sheets-Sheet '7 July 14, 1953 c. A. LEVIN 2,645,174

I DRUM STOP MECHANISM FOR ROTARY DUPLICATING MACHINES Filed Aug. 4, 1949 I 11 Sheets-Sheet 8 J 179 177 2 m Z5 i y 4, 1953 c. A. LEVIN 2;645,174

DRUM STOP MECHANISM FOR ROTARY DUPLICATING MACHINES Filed Aug. 4, 1949 11 Sheets-Sheet 9 jrIzferz 0 7'" Carl 9%. Zea/27a Z W? yffzorzzegs July 14,1953 2,645,174

DRUM STOP MECHANISM FOR ROTARY DUPLICATING MACHINES c. A. LEVIN l1 Sheets-Sheet 10 Filed Aug. 4. 1949 &'

@Yoziis July 14, 1953 c. A. LEVIN 2,645,174

DRUM STOP MECHANISM FOR ROTARY DUPLICATING MACHINES Filed Aug. 4. 1949 11 Sheets-Sheet 11 ofzyarzn ys Patented July 1 4, 1953 UNITED" STATES PATENT OFFICE 7 .2545174" a t DRUM sror Ms'oHANisMiFoi onny DUPLIC A'TING MACHINES Carl A. Levin, Park Ridge',"-'I!l.,-a'ssig'hor -to mifto,

Incorporated, Chicago, 111.,

West Virginia a. corporationv of A pncationmignst 4, 1949, Serial No. 108,471

The present invention relates to a duplicating machine and in the present instance is illustrated in conjunction with a machine of the wet process type. In this type of machine a master the drum and the platen by a pair of feed'rollers,

at least one of whichis moistened over its peripheral surface. As the blank sheets are fed between the feed rollers the moistening roller transfers some of the liquid onto the face of the blank sheet that next engages the master sheet that is inouhted on the drum. Typed material on the master sheet is thereby transferred to' the moistened sheet and the sheet is then deposited on a'tray or platform located on the discharge side of'the drum.

It is an object of the present invention to provide aduplicating machine of this type that is electrically driven and one-wherein the drum can,

be selectively stopped at different positions.

It is also an object of the invention to provide asimple device for automatically removing the master sheet from the drum without requiring the operator to place his hands either on the master sheet or on the drum. All of this is intended to be accomplished with a device and mechanism that is extremely simple, both in structure and in operation. L

The foregoing constitute some of the principal objects and advantages of the present invention, others of which will become apparent from the following description and the drawings, in which Fig. 1 is a vertical, sectional view taken through the machine and base, the machine being shown mostly in side elevation;

Fig. 2 is a vertical, sectional view taken through the base of the machine, the view being taken along the line 2-2 of Fig. 1; V

Fig. 3 is a horizontal, sectional view taken through the base of the machine, the view being taken along the line 3-3 of Fig. 1 ;,v

Fig. 4 is an enlarged, fragmentary, vertical. sectional view through the lower-part of the ma chine base;

Fig. 5 is an enlarged, fragmentary, detail view shown partly in section of the manual push button operating mechanism; f

Fig. 6 is a side elevational" view shown partly in section of the motor clutch u'nit forming the drive for the present machine;

Fig. 7 is an enlarged, fragmentary, side eleva- 4 eads; 01. .101132) tional view of the machine proper, taken from one side' of the machine with'part of the case removed, illustrating certain of the operating mechanisms'for the machine; Fig. 8 is an enlarged, fragmentary, side elevation'al view of the machine proper taken from the same side of the machine, with a portion of the side frame of the" machine broken away to illustrate the master clamp operating mechan-ism; v r

Fig. 9 is a fragmentary, horizontal, sectional view through the machine, the view being taken along the line 9'-9 of Fig. 8;

Fig. 10 is -a fragmentary, vertical, sectional View through-the machine, the View being taken along the line I lllll'of Fig.7 p

Fig. 11 is a horizontal, sectional view taken through the machine, the view being any fragmentary and taken along the line 'l'l-'- l I of g J Fig. 12 is a fragmentary, vertical, sectional view through the machine, the view being taken along the line I2f2 o fF-ig. 1'0; I Q

- Fig. 'l3-i's a fragmentary view corresponding to Fig. 12 but illustrating the master clamp operatingmechanism in master release position for automatically discharging the master sheet; Fig. 14 is a fragmentary, side elevation-a1 view with a portion of the-case removed, the view being taken from the other side of the machine from that shown in Figs. 7 and 8 I Fig. 15 is a fragmentary, vertical, sectional view taken through the machine, the view being taken along the line [5-45 of Fig. 14; and

Fig. 16 is a wiring diagram illustrating the electrical circuit for controlling and operating thepresent machine.

For purposes of illustration a single embodiment of the invention is shown in the drawings and will be described hereinafter. It is recognized, of course that many variations maybe made in the embodiment shown Without departing' from the intended scope and spirit of the invention. I

Referring now to Fig. lot the drawingsa device embodying the present invention is illustrated in the form of a duplicating machine generally indicated at 20 that is mounted on a stand generally indicated at 2] which "in turn rests on a'base generally indicated at 22.

The machine 20 comprises 'apair of upstanding spaced side frame members 23 and-glycetween which frame members or walls is disposed a rotatable *drum" 25 that is journalled as at 26 in the spaced walls 23 and 2L This'druni 25 is of a conventional type used in duplicating machines. Directly below the drum is a platen 21 (see Figs. 2 and 12) that engages the peripheral face of the drum 25 and is rotatably mounted on sub-frame members 28 illustrated in Fig. 2. On the feed side of the drum 25 is rotatably mounted a pair of feed rollers 29 and 30 held in engagement with each other, the feed roller 29 also serving as a moistening roller in a conventional manner. The feed rollers 29 and 30 are rotated in a conventional manner simultaneously with the rotation of the drum 25, the manner of rotation of the feed rollers 29 and 30 being intermittent so as to feed copy sheets into the bite between the platen 21 and the drum 25. As best shown in Fig. 2 the drum 25 is mounted on a shaft 3|, on one end of which is mounted a pulley wheel 32.

The stand generally indicated at 2| in Figs. 1 and 2 includes an upper wall or platform 33 on which the duplicating machine 20 is mounted. Suspended downwardly from this upper platform 33 is a bracket 34 that is secured in some suitable manner as by screws or rivets 35 to the platform 33. Mounted at the lower end of this bracket 34 is a shaft 36 on which is mounted a large pulley wheel 31 and a small pulley wheel 36. Extending between this small pulley wheel 38 and the pulley wheel 32 on the end of shaft 3| is a drive belt 33. In the lower part of the stand 2| is mounted a motor clutch device generally indicated at 46 that rests on a supporting base 4|. This motor clutch device has a motor portion 42 and a clutch portion 43. A shaft 44 extends outwardly from the clutch portion and mounted on this shaft is a pulley wheel 45. A drive belt 46 is mounted over the pulley wheel 45 and over pulley wheel 31 on the shaft 36. When the motor portion 42 is operated and the clutch 43 to be more fully described hereinafter, is energized, the shaft 44 is rotated so as to drive the drum 25 of the duplicating machine 20 through belt 46, pulley wheel 31, belt 39 and pulley Wheel 32. In this manner the drum 25 and platen 21 are rotated and power from the same source is likewise transmitted to the feed rollers 29 and 30 in a conventional manner (not shown).

Referring now to Fig. 6 the motor clutch device 46 includes a conventional motor 42 that is provided with the motor shaft 44. The clutch portion 43 of the motor clutch device comprises a rotor 41 that is keyed or otherwise fixed to the motor shaft 44, and a cup-like stator 48 that is fixed to the pulley wheel 45. Between the motor shaft 44 and the pulley wheel is a ball bearing assembl generally indicated at 49 that includes inner race members 50 that are fixed with respect to the motor shaft 44 and outer race members 5| that are adapted to sandwich therebetween ball bearings indicated at 52. Thus the motor shaft 44 with its electromagnetic rotor 41 is rotated independently of the pulley wheel 45 and the cup-shaped stator 48.

The rotor 41 may be of a conventional type for a magnetic clutch that includes a field winding 53 that is energized from an electrical source through contact brushes 54 and 55 that operate on commutators 56 and 51 respectively. The

field winding 53 is placed in an electrical circuit with the commutators 56 and 51 in a wellknown manner and the brushes 54 and 55 are placedin a circuit with a source of electrical current by suitable conductors 58 and 59 respectively. Thus during the operation of the motor the motor shaft 44 is rotated and the field winding 53 of the electromagnetic clutch is caused to rotate with the motor shaft 44. During the period when the field winding 53 of the rotor is deenergized this rotor 41 rotates with the shaft 44 while the pulley wheel 45 and the stator 48 remain stationary. Upon closing of the circuit through the brushes 54 and 55 the field winding 53 of the rotor 41 becomes energized so as to rotate the stator 48 with the rotor 41, thereby rotating the pulley wheel 45. The drive for the drum 25 is thus established through the driving belts previously described and shown in Fig. 2.

Mounted on the frame of the motor clutch unit 46 (Fig. 6) is an electromagnetic brake generally indicated at 60 that includes a stationary electromagnetic field ring 6| supporting an electromagnetic field winding 62. This fixed ring is supported on an annular supporting ring 63 that is fixed to the machine oasing in a suitable manner as by a plurality of bolts, one of which is illustrated at 64 in Fig. 6 threaded to receive a nut 65. This field winding 62 is connected through a suitable electrical circuit to a source of electrical current and will be more fully described hereinafter in connection with the wiring diagram illustrated in Fig. 19. Upon energizing the field winding 62 of the electromagnetic brake 60 the rotating stator 48 of the electromagnetic clutch 43 is brought to rest in a well-known manner resulting in the sudden stopping of the rotating drum 25 of the duplicating machine 26.

Disposed in the base 22 (see Figs. 1, 3 and 4) is a lever 66 that is mounted substantially at its midpoint on a shaft 61 to which the lever 66 is secured by a pin or the like shown at 68 in Fig. 3. This shaft 61 in turn is journalled adjacent to its opposite ends in bearing members 69 (Fig. 3) that are fixed with respect to the base 22. Lever 66 extends to the forward end of the base 22 and mounted in the base 22 directly over the forwardmost end of the lever 66 is a foot trip button 10 that is slidable in a substantially vertical direction in the base 22 and extends upwardly above the base, having on its upper end a knob 1|. As best shown in Fig. 3 there is mounted on the opposite end of the shaft 61 a lever indicated at 12 that is pinned as at 13 to the shaft 61 and projects forwardly toward the forwardmost end of the base 22 a distance corresponding to that of lever 56. A second foot operated trip button 14 is mounted in the base 22 directly over the forwardmost end of this secondlever 12. Thus when either of the foot operated trip buttons 10 or 14 is depressed, the lever 66 is caused to pivot with the shaft 61 as its fulcrum.

The free end of lever 66 engages the lowermost end of a lower segment 15a of a vertical rod 15 that extends vertically through the stand 2| as best seen in Figs. 1 and 4 and projects downwardly into the base 22. The upper end of rod 15 projects through the aperture in a bracket 16 that is fixed to the frame of the stand 2|. Pivotally mounted on a portion 11 of the frame of stand 2| is a lever arm 18 that engages the upper end of the vertically disposed rod 15. This lever arm 16 is fixed to a shaft 19 that is rotatably mounted in the portion 11 of the frame (see Fig. 2). Also mounted in fixed relationship on the shaft 13 is a lever arm to the free end of which is pivotally mounted a link 8|. The upper end of this link BI is pivotally mounted on one end of a lever 82 (see Fig. '7). This lever swear 82 in turn is pivotally mounted at itsopposite end at 83 to the side wall 23- ofith'e machine. A second arm 84- is also pivoted at 83 tothe side wall 2 3 of the machine and this second lever arin lid is provided with a rearwardlyextending portion 85 having a horizontally extending flange 33 thereon'that overlies the top of lever 32'. Mounted adjacent to the free end of the lever arm fi lis an upstanding boss 81 that is adapted to engage a lug or knob 88 on a trip switch generally indicated at 891 Disposed ever the free end of lever arm 84 is a link 90*that isslidably mounted as at 9i on a pin that is securedto the side wall 23 of the machine, this pin being adapted to ride in a slot 92 in the link 90.

link 90 projects downwardly below the pin 3i and engages a horizontally disposed flange 9'3 on the end of lever arm 34. The upper end of'l ink 90 is pivotally mounted at 94 onto one end of alever arm 95'. The other end of this lever arm 95 is mounted in fixed relationship on a hori zontally disposed shaft 96 that is journal-led between the side walls 23 and 24 f the machine. As best shown in Figs. 5, 7 and 12 an arm 91 extends downwardly from this shaft 06 and is provided on its free end with a hand'operated trip button 98 that is disposed on the front of" the machine.

Again referring to Fig. 2* there is providedabout the upper end of the vertical rod 15- a COlTlpl'S sion spring 99 that is seated between the bracket it at the upper end thereof and a collar' I0'0 that is fixed to the rod 15. When either of the foot operated trip buttons 10-01" M (Fig. 3) or'the hand operated trip button 9 8 (Fig; or 7-) is depressed, the lever and 84 is caused to' rotate in a clockwise direction about its axis of rotation indicated at 83- in Fig. '7 so as toclose the normally open trip switch 89. Upon release of pressure on the foot operated trip buttons I0 or I4 or the hand operated trip button 90-, a

spring l0I (Fig. '7) returns the lever arm 04 to its normal trip switch open position (Fig. I). This spring I 0I is fixed at one endas at I02 to the side frame 23 of the machine and at the other end as at I03 to the lever arm 84-1 The operation of the hand operated trip button 93 is best understood from the showing in Fig. '7. When this trip button 98 is depressed it rotates the shaft 96 in a clockwise direction as viewed in Fig. 7 so as to rotate the arm" 95 in the same direction. This moves link 90ina;

downward direction against the flange 9-3 'onthe end of lever arm 84 so as to rotate this lever arm 84 in a clockwise direction about 'itsaxis of rotation indicated at 83. V 7

When either of the foot operated trip buttons F3 or M is depressed it rotates the lever in the manner previously described with respect to r the showing in Figs. 1 and 4, this rotation being.

in a clockwise direction as viewed in Fig; 4 so as to move the rod 75 inan upward direction against the pressure of compression spring 93 This upward movement of therod 15 (see Fig. '7) rotates the lever arm 18 in a clockwise direc-- tion so as to similarly rotate the shaft 19. This causes rotation in a clockwise direction as viewed in Fig. 7 of the arm 80, carrying with it-in an upward direction a link8'l. As a result of this the lever 82 rotates in a clockwise direction about its axis of rotation indicated at 83 so as to apply an upward force against the flange 86 that extends over the top of lever 02, thereby effecting rotation of lever arm 84 in a clockwise direca tion about its axis of rotation indicatedat 03-.

ously'descnbed'. g

Referring to Figs. 1 and 3 -a horizontal shaft I02 is journallediat' its opposite endsi-n brackets I05 that are secured to base 22. Extending outwardlyfrom the center of this shaft IIllI-is "an arm I06 that is fixed to the shait'and this -arm projects through the front wall of the base 22 and is provided on its free end with a foot pedal I 01. Also fixed to the Shaft I01 is 'arl arm I08, to the free end of which issecured a link I09 that extends upwardly through the stand 2| and into the machinelli (see Fig. 7 Adjacent to the upper end of this link I00is disposed-a bell crank lever H0 that is ivoted about an axis III that is fixed to the machine side frame" 23. The link I09 is secured as at I? to one end of the bell crank H 0; Whereas-theother free end of the bell cranlrfis fastened asat N 3 to one end of a tension spring II 4! Thefother once again the-'trip'switch 33 1s closed asreviend of the spring .I it is fastened at us a; the

II9. This latter bell crank lever He is pivoted,

as at I20 to a fixed pin on the wall 23 of the machine (see- Figs. 7 and 8). I I

Mounted behind the bell crank lever H9 is a lever arm indicated at I2-I in'Fig. 8 that is pivoted as at I'22to the machine side wall 23. This and I2] is provided with an outwardly 'pro jetting portion I23 intermediate its ends that is slotted as at- I24 toreceive a lug" I25 that 'pro J'e'cts from thebell crank lever H9. The free end of lever I-ZI is provided with a turned-over flange I26. Mounted adjacent to this last mentloned end of the lever arm I2I is a'nactuating arm I21 that is pivoted onto a shaft I20 that is journalled about its opposite ends'on the drum. As best shown in Fig. 12 the drum;25is provided with a conventional master clamp assembly generally indicated at I2 9 that includes a housing portion I30 formed in the drum 25, and a movable" clamp member I3I that is slidable and out of this housing portion I30. "A pair of spaced posts I32 is secured to the'movable clamp member I3I, andeach post I32 is provided with ahead I33 so as to form one seat for a compression spring I34 that fits between this head I33 and the wall of the housing I30. Thus the compression spring I34 normally holds the master clamp member I! in its innermost p0si-' thin in the housing I 30.

A master sheet is illustrated in Fig. '12 at I35 New member I30 on the movable master clamp member "I and a seat portion I31 on the drum 25 that forms in efiect 'a complementary jaw that cooperates with the movable jaw 1 30. In the position shown in Fig. 12 the ma ter: sheet I35 can be placed on the drum. and the end to be clamped is positioned between the movable clam l3 and the seat I31. Int-his position the movable clamp member I3I is disposed in its outermost position with the com ressionspriiigl3't fully compressed. Toplace the movable; clamp member I3I in this-open position an arm I38 is fixed to shaft l20'an'd when this arm is in the position shown in Fig. 12 it engages-the head I33 of post I32 to compressispring. I34 and place the movable clamp member I'I'3I' in its open position.

In the embodiment of the invention shown there are two such posts I32 and hence two arms I38 are provided on shaft I28, each being suitably located to engage its corresponding post I32. Movement of arm I38 about its axis of rotation, which is the shaft I28, is effected by rotating this shaft I28 either in a clockwise or counterclockwise direction, depending upon the desired position of arm I38. Movement of arm I38 in a clockwise direction as viewed in Fig. 12 will permit the movable master clamp member I3I to return to its closed position in response to the expansion of compression spring I34.

Shaft I28 is rotated in response to movement of foot pedal I01, this movement being imparted to the shaft I28 through arm I08, link I09 (Figs. 1, 4, '7 and 8) bell crank levers H and H9, arm I2I and finally arm I21, which in turn is secured to shaft I28. The spring I I4 normally holds the mechanism just described so that the foot pedal I01 is in its uppermost position in condition to be moved downwardly so as to rotate shaft I04 (see Fig. 1) in a clockwise direction. The drum 25 when in the position shown in Fig. 12 where the master clamp I29 can be opened and closed in the manner just described is in what is commonly called the master clamp position.

Mounted on the shaft 3I of the drum 25 as best shown in Figs. 14 and 15 is a cam 139. This cam I39 (see Fig. 15) is actually mounted concentrically about the hub portion 32a of the pulley wheel 32 and is secured to the pulley wheel by means of a plurality of nuts I40. This cam I39 has substantially a circular circumference throughout most of its periphery but is provided with an inwardly cam valley portion I4I that has an innermost concave portion I4Ia at one position on the circumference of the circle. Bell crank levers I42 and I43 are pivotally mounted as at I44 and I45 respectively on plates I4 2 a and H311 respectively. These plates MM and I43a are provided with arcuate slots I42?) and I 43b respectively and are secured to the machine wall 24 by screws I50 and I55 passing through slots M222 and M31) respectively.

These bell crank levers I42 and I43 are disposed at the same distances from the shaft 3I about the center of which the cam I39 rotates, but are spaced at different positions circumferentially with respect to the cam I 39. The bell crank lever I42 is provided with a cam follower I46 at the end of one of the arms and with a switch actuating knob I41 at the free end of the other arm. The follower I46 is adapted to ride. along the peripheral surface of the cam I39 and the switch actuating knob I41 is adapted toengage and operate a switch generally indicated at I46. A tension spring I49 normally serves to urge the bell crank lever I42 to rotate in a counterclockwise direction as viewed in Fig. 14 so as to hold the cam follower I 46 firmly against the periphery of the cam I39. r

Similarly the bell crank lever I43 is provided at one end of one of its arms with a cam follower II that is adapted to ride on the peripheral surface of the cam I39. The other arm of the bell crank lever I43 is provided with a switch actuating knob I52 that actuates the electrical switch generally indicated at I53. A tension sprin I54 normally urges the bell crank lever I43 to rotate in a counterclockwise direction as viewed in Fig. 14 so as to cause the follower I5I to rest firmly against the peripheral edge of the cam I39. Thus as the cam I39 rotates with shaft 3| the cam followers I46 and I5I ride along the periph eral edge of cam I39 and while the cam follower is riding along the normal circumference of uniform radius, the switches I48 and I53 are maintained in their closed position illustrated in Fig. 14 where the switch points I56 of switch I48 are in contact with each other. When either of the cam followers I46 or I5I rides down into the valley or concave portion I4I, the corresponding bell crank I42 or I43 rotates in a counterclockwise direction about its respective axi of rotation so as to separate the corresponding contact points as shown in the case of switch I53 where contact points I51 are separated. In this latter position switch I53 is open. The exact position of the bell crank levers I42 and I43 can be carefully adjusted by movement of plates I42a and 143a respectively. The position of these plates is fixed by tightening screws I50 and I55.

As will be described hereinafter switches I48 and I53 are made tov operate in the control circuit which will also be described hereinafter by manipulation of a selector switch generally indicated at I58 in Fig. 7.

Pivotally mounted as at I59 (Fig. '7) on the wall 23 of the machine is a selector arm I69. This selector arm has provided thereon an actuating projection I6I on the free end of which is an out-turned flange I62. Also mounted on the machine wall 23 for pivoting as at I63 is a bell crank lever I64, one arm of which is disposed adjacent to the flange I62 on the selector arm I60. The other arm of the bell crank lever IE4 is provided adjacent to its free end with an out-turned flange I65 that is adapted to engage a knob or lug I66 that is disposed on a central leaf I61 of the switch I58. This central leaf I61 has a contact point I63 on one side that is adapted to engage a corresponding contact point I69 on a leaf I10 of the switch I58. On the opposite side of the central leaf I61 is a second contact point I1I that is adapted to engage and make electrical contact with a contact point I12 on a third leaf I13 of the switch I58.

When the selector arm ISO is in the solid line position shown in Fig. 7 the bell crank lever I64 maintains the contact points I68 and I69 of switch I58 in engaged or closed circuit condition. When the selector arm I60 is moved in a clockwise direction to the position shown in broken lines at IBM in Fig. 7 the bell crank lever I64 is rotated in a counterclockwise direction about its axis of rotation I63 as viewed in Fig. 7 so as to allow the central leaf I61 to move in a clockwise direction as viewed in Fig. 7 to open the contacts I68 and I69, and close contacts Ill and I12. A spring I14 fastened to the selector arm I60 at I15 and at the other end to the sidewall 23 of the machine at I16 serves to hold the selector arm I66 either in its solid line position shown in Fig. 7 or in its broken line position shown at IBM.

Again referring to Fig. 14 the switch I48 may be termed for purposes of illustration the seventeen inch position switch, whereas the switch I53 may be termed the fourteen inch position switch. By this is meant that when copy sheets seventeen inches long are being passed through the machine the seventeen inch switch I48 is brought into the control circuit, whereas when fourteen ineh length copy sheets are being used the fourteen inch switch I53 is placed into the circuit. The selection as between these two switches is made by manipulation of selector switch I58 (Fig. 7) in the manner just 9 dggcribed by manual operation of selector arm I.

Under certain circumstances it may: be desirable to remove the master sheet from the machine autimatically. To accomplish this a manual operated master ejector button I11 (see Fig. '7) is mounted toslide up and down on a pin I18. This master ejector button. I11 is shown in the form of. a plate-like member provided with an over-turned flange I19 at its upper end and is vertically slotted at I88- so that it. can ride. vertically on the pin I18. The lower end of the button member I11 is pivotally attached as at I 8| toone arm of. a bell; crank lever I82. Adjacent to the free end of the other arm of the bell crank lever I82 is. disposed a. switch actuating knob or projection I83 that. is adaptedto abut against the flange I85 of bell crank lever I64 so as to move.- the central leaf I81 of switch I58 to the. position shown in Fig. 7 where control of theduplicating machine just described contacts I68 and I69 are closed. The bell crank lever I82; is normally biasedto hold, button I11 in its uppermost position by spring 'I82a;

Adjacent to the free end of the last mentioned arm of bell crank lever I82, there is provided in the machine. wall 23- a horizontal slot indicated at I84, through which projects a lug I85 that is fastened to the free end of the last mentioned arm of hell crank lever I82. Disposed. on the inside of this. machine wall 23 and pivoted as at I86 to the wall. is an arm I81 (see Fig. '7) that. is provided witha downwardly projecting portion I88 that is slotted at I89 to receive the free end of lug 1.85. The arm I81 is also provided with an inturned flange portion I88. The arm I81 is adapted to move about its axis of rotation I88 from a more or less horizontal position shown in Fig. 8 that. corresponds to the uppermost position. of the: ejector button I11 to a downwardly inclined position. illustrated in Fig. 7 corresponding to the depressed position, of the master ejector button I11. In this latter position corresponding to the depressed position of the master ejector button I11 the flange I98 on the lever I81 is disposed; in the. path of arm I21 (Fig. 8') as the drum rotates. Thus the flange I98 engages -arm I21 when. the latter is in proper position so as to rotate. shaft I28 to move arm I38 (see Fig. 13 to. open master clamp I29 so. as. to release the master sheet shown at I35. In other words, when the master ejector button. I11 is depressed andheld in this depressed condition shown in .Fig. '1 the master clamp I29 is. momentarily opened when the drum reaches the position shown in, Fig. 13 by virtue of the fact that arm I21 (Fig. 8) strikes the flange I98 on arm I81. A stripper I9I mounted on ashaft I92 is disposed adjacent to the drum at. this master release position. shown in Fig. 13. This shaft I92 is rotatably mounted, and fixed to the shaft is an. arm I93 (Figs. 10 and 11) that is engaged by the lug I85. Thus when the master ejector button I11 is depressed the arm I93 is rotated in a counter.- clockwise direction about the center of shaft I92. carrying with itthe shaft. and moving the stripper I9I to the broken line position shown in Fig. '7. This stripper is normally maintained by .a spring illustrated at I94- in the inoperative position illustrated in Fig. 12'. This spring I94; is secured at one end as at I95 to the side wall 23 of the machine and at the other end at I 99- g to the arm I93.

Operating circuit The. electrical circuit for the operation and.

is. shown in Fig. 16. The power line 'or source of current is illustrated at I91. From this power line a conductor I98 is connected to a fuse I99. The otherside of the fuse I99 is connected by a conductor 288 "to one, side-of the primary winding of a transformer .28I. From the other side of the primary winding of transformer 2!" is a conductor282 that is connected to one terminal 283 of a receptacle 284. To this terminal 283 is connected aconductor285 that is connected to one side of a main power switch 286 that is conveniently located on the machine. To the other side. ofpower switch 288 is connected a conductor 281 that isconnected at. its other end. to terminal 288 of the receptacle 284 and then through conductor .289 tothe other side of thepowerline I91. Thus when the; power switch 286 is closed the circuit just described to the primary side of the transformer 28 I is energized.

A plug. 2I8 is adapted to be inserted in the receptacle 284 .and when this is done terminal 2| I clutch device. Allis placed in a circuit that in cludes' the power line I91,- conductor I98, fuse.

I99, a conductor 2.14, terminal 213 of receptacle 284- 'which-at this-time as is diagrammatically indicated by conductor 214 is. connected to terminal 21.2. on plug. 2 I8, and then through line 2 I5 to one: side of the motor clutch device 48- and.

then from the other side of the motor clutch device 48 through-conductor-2I8, terminal 2II on conductor 285 powerswitch 288and-conductor 281 to terminal 288 of receptacle 284, and finally back to the other. side of the powerline I91 through conductor 2.89 At the same time. that this power. circuit just described is closed there is a light circuit. that is energized so asto illumi nate light bulb 218. This circuit includes a conductor 219; connected at one end to the live line '285 and at the other end to the light bulb 218..

Conductor line 228 is connected atone end to the other side of light bulb-2.88 and atthe other end is connected to the live terminal 2I3- of receptacle. 28.4. l

To the secondar winding of the transtormer of rectifier 2.22 there is connected a conductor 224 that extendsto one side of a clutch relay indicated at 225. The clutch: relay winding for clutch 225 isi-ndicated at 226. A conductor .221 connects the other side of clutch relay-winding 2.2 6 to one side of. the trip button 89. The otherside. of the trip button 89. is. connected by means. of. conductor 22.8 and conductor 229 to the other side of the rectifier .222- The trip buton 89 is. normally held in open. condition but when it is closed the clutch relay winding 226 is placed in the circuit with the rectifier 2.22., and hence the secondary of transformer 281', and is thereby energized. Toone side of the relay winding. 226 there is also connected a conductor 239'that extends to one side of a relay switch 23I that is operated by relay 225. This relay switch 23I' is normally spring;

biased. in openjposition against. a. stop indicated air-.232. electrical contact. indicated at 233 is.

adapted to be engaged by relay switch 23I and this contact 233 is connected by means of a conductor 234 to the central leaf I61 of the selector switch I58. ihis selector switch I58 can either close a circuit that includes the switch I53 or a circuit that includes switch I48. To accomplish the first the central leaf I61 is moved to bring contact points I68 and I69 together and the circuit then includes a conductor 235 that is connected at one end to leaf I19 of selector switch I58. The other end of conductor 235 is connected to one side of the switch I53. The other side of switch I53 is connected through conductors 236 and 229 to the rectifier 222. The circuit through the relay winding 226 is thus completed from the rectifier 222 through the conductor 224.

When the central leaf I61 of selector switch I58 is moved so as to bring contact points HI and I12 into engagement a circuit is completed through leaf I13 of switch I58 and conductor 231 to one side of switch I48. The other side of switch 548 is connected through conductor 238 to conductor 236 and the circuit can then be traced in the manner just described except through switch I48 instead of switch I53. The circuit just described may be referred to as a holding circuit for the clutch relay 225. The circuit previously described that connected the trip button 89 may be referred to as the initial actuating circuit for the clutch relay 225. This actuating circuit, however, is only momentarily energized so long as the trip button 89 is depressed, but as soon as this trip button 89 is released the holding circuit maintains the clutch relay 225 energized until the holding circuit is interrupted by manipulation of one of the switches I48 or I53.

To one side of the rectifier 222 there is connected a conductor 239 that is connected at its other end to terminal 240 of plug 2I5. Conductor 58 of the clutch shown in Fig. 6 is attached to this terminal 240 so as to connect the brush 54 to one side of the circuit. Conductor 59 connects brush 55 of the clutch 43 to terminal 24I of plug 2I0. To this terminal I is connected a conductor 242, which in turn is connected to a switch contact 243 of the clutch relay or circuit breaker. In this instance a second switch blade 23Ia is provided in the clutch relay circuit breaker that moves in response to the operation of the clutch relay 225. To the relay circuit breaker or switch blade 23Ia is connected a conductor 244, which in turn is connected through conductor 229 to the other side of the rectifier 222.

Also connected to the terminal 240 of plug 2 I through conductors 58 and 245 is the magnetic brake indicated at 60 (see Fig. 6). A conductor 246 (Fig. 16) connects the other side of brake 60 to a terminal 241 of plug 2H! and hence through terminal 248 of receptacle 204 (shown connected to terminal 241 by conductor 249) and through conductor 250 to a contact point I of the relay switch. As shown in Fig. 16 the switch blade 23Ia normally engages the contact point 25I so that the brake circuit just described is completed through this blade and hence through conductors 244 and 229 to the opposite side of the rectifier 222.

Operation In operating the duplicating machine just described the electric cord for the machine is first attached to the power line I91. The power switch 206 is then closed so as to place the motor 42 of motor clutch device in operation. Light 12 bulb 2 I8 at the same time is placed in the closed circuit so as soon as power switch 205 is closed light bulb 2 I8 is energized and glows.

At the same time the circuit to the magnetic brake is also energized inasmuch as the relay switch 23Ia is disposed in the solid line position shown in Fig. 16. Thus though the motor 42 of the motor clutch unit 48 is operating the drum 25 (Fig. 2) remains still and is actually held still by the braking action of the magnetic brake 69. Let it be assumed that the drum 25 is in the master clamp release position shown in Fig. 12 where the master clamp I29 is disposed above the horizontal and shown in solid lines.

The first operation in using the machine is to apply the master sheet I35 to the drum 25. This is done by first depressing the foot pedal I01 (see Fig. 1) which opens the master clamp I29 so that the edge of the master sheet I35 can be'inserted between the jaw portion I36 of the master clamp I29 and the seat portion I31. The foot pedal I81 is then released to close the movable clamp member I3I. The machine is now in condition for operation.

By applying pressure to the hand operated trip button 98 (Fig. 12) 'or one of the foot operated trip buttons 16 or 14, the circuit through the clutch relay 225 (see Fig. 16) is closed so as to deenergize the circuit to the magnetic brake 68 (by movement of relay switch 23Ia to the broken line position shown in Fig. 16) thereby releasing the brake and at the same time the circuit to the magnetic clutch 43 is closed so as to drive the drum 25 from the motor 42. As long as the hand operated trip button 98 or the foot operated trip buttons 18 or 14 are held in depressed position the motor 42 continues to drive the drum 25 (see Fig. 2) through clutch 43.

As previously mentioned the present machine is adapted to accommodate master sheets of different lengths. For purposes of illustration the present embodiment is shown to accommodate master sheets fourteen inches long or seventeen inches long. For copy sheets fourteen inches long it is desired that one complete revolution of the drum 25 commence at the solid line position of the master clamp shown in Fig. 12, whereas for copy sheets seventeen inches long the revolutions of the drum 25 commence from the broken line position illustrated at I 29a in Fig. 12. In order to select one or the other stopping position for the drum 25 the selector switch I58 operated by selector arm I69, shown in Fig. 7, is provided.

As previously mentioned the selector arm I68 selects the proper circuit to be controlled by selector switch I58. One of these circuits as shown in Fig. 16 includes switch I42 and the other of said circuits includes switch I53. Thus if the selector lever I69 is set to place switch I48 (see Fig. 16) in the control circuit, then as the drum 25 rotates the cam I39 (see Fig. 14) opens and closes switch I48 in the manner previously described.

It makes no difference at the outset what position the drum 25 assumes because upon depressing the trip button (either trip button 89, 10 or 14) the clutch relay 225 is energized to place the motor 42 into driving relationship with the drum. Thus the drum 25 rotates and even though the trip button just depressed is returned to its open position the relay 225 continues to be energized through the switch I48 until the cam follower I46 (see Fig. 6) enters the valley amen-74 I3 I4I of cam I39. been opened by virtue of the movement of. bell crank lever I42, thereby'breaking' the circuit to the clutch relay 225 (if trip button 89",. ID or I4 is no longer being depressed) to deenergize the magnetic clutch 43 and simultaneously energize the magnetic brake: 60.

In this position switch I48has' The drumis thusstopped at this seventeen inch position in re-;

sponse to the operation of switch I48. Upon".

continued operation of the? duplicating machine the drum will stop (when the: actuating trip but-'- ton 89, IE3 or T4 is released) only when the drum cycle has been completed; that is, when the cam follower I4 6 has again entered valley I III in the eain'lfiil (see-Fig. 14); f

Similarly, by moving the selectorlever I60 to its other position so as to place. the fourteen inch switch I 53 in the circuit, the stopping position of the drum 25 will respond to thefmovementof bell crank lever Hi3, which in turn responds. to the position of cam follower IEI on the peripheral surface of cam I39.

Referring to Fig. 12 copy sheets are fed be,- tween feed rollers 29' and 36 which are rotated in a conventional manner so as to move the copy sheets into the bite between platen 21 and the drum 25. The print on the master sheet I35 is then transferred onto the copy sheet as the latter is fed between the platen 21 and the drum 25, and then the copy sheet is transported to a tray or similar receptacle (not shown) on the discharge side of the drum 25.

After the duplicating operation has been completed it may be desirable to remove the master sheet :35 automatically. This can be accomplished in the present device by simply depressing the master ejector button IT! and holding this button down while at the same time depressing one of the trip buttons 89, I or I4. By depressing the master ejector button III the bell crank lever 564 (Fig. 7) is rotated in a clockwise direction so as to move the central leaf I61 of selector switch I58 to the position closing contacts I68 and I69, thus placing switch'I53 (Figs. 14 and 16) in the control circuit. This movement of bell crank lever I82 also raises the arm I8? into position to strike the arm I21 (see Fig. 8) to rotate this latter arm in a counterclockwise direction as viewed in Fig. 8 to cause arm I38 (Figs. 8, l2 and 13) to strike the knob or head I33 of shaft I32 of the master clamp I29. This momentarily opens the master clamp I29 in the position shown in Fig. 13 so as to release'the .previously clamped edge of the master sheet I35. The movement of bell crank lever I82 previously described also places the stripper I9I (Figs. 12 and 13) in its operative position shown in Fig. 13 so as to strip the master sheet I35 off the face of the drum. Throughout the remainder of the revolution of the drum 25 this master sheet I35 is deposited in the tray or like receptacle on the discharge side of the drum.

I claim:

1. A duplicating machine comprising a drum embodying means for supporting a master sheet and a pair of intermittently rotating sheet feed rolls driven therefrom, non-blocking braking means to cause said drum to come to a stop in either one of two positions, a cam carried on said drum and rotating therewith, two cam followers angularly spaced from each other by a distance corresponding to the angular distance between said two stop positions and engaged by said cam, a pair of normally closed cam switches located peripherally with respect to the drum and each being associated withxand.actuatedby-oneof said.- cam followers, electromagnetic means for causing, when deenergized, actuation of said braking means, a power source, sai'dcam switches'beingconnected in parallel with each other and in series circuit with said electromagnetic means and said power source, whereby the opening of either one of said cam switches incident to the rotation of said drum and cam would de-energi'ze said electromagnetic means to actuate said brake, and a selector switch for alternatively cutting one or the other'of said cam switches out of said series circuit thereby permitting selection of one or the other of said two'positions into which said drum willbe caused to come to a stop.

2.; A duplicating machine comprising a drum for supporting a master sheet, intermittently'rof tating fe'edrolls driven from, said drum and serv' gagement with a master sheet secured to said.

drum, a master clamp. provided on said drum for securing a master sheet thereto, driving means for said drum including non-blocking braking means and non-blocking clutch meansadapted for alternative operationfor causingsaid drum to. come to a stop in a position in. whichv said feed rolls are stationary and. for causing said drum to be again placed in motion, respectively, and means for actuating said braking means a1- ternatively at two different points in the drum cycle whereby said drum will come to a stop in a normal position suitable for duplicating on sheets of standard length and in a second position for duplicating on sheets of a length greater than standard length, said means including a cam rotating with said drum, two cam followers mounted about said cam in an angularly spaced position with respect to each other, one of said cam followers being located at a position in advance of said normal stop position by an angular distance corresponding to the distancethrough which the drum will move between the time said braking means is actuated and the time that said drum comes to rest, and the other of said cam followers being located at a position in advance of said greater length of sheet'stop position by a similar angular distance, two cam switches actuated by said cam followers, a selector switch associated with said cam switches, electromagnetic means for actuatin said brake actuating means, and a power source, said cam switches being con nected in parallel with each other and in series circuit with said power source, said selector switch, and said electromagnetic means whereby said selector switch may be actuated to cause said drum to come to a stop either in said normal position or in said second position.

3. A duplicating machine as claimed in claim 2 having first clamp control means for opening said master clamp when said drum is at rest insaid a pair of intermittently rotating sheet feed rolls driven from said drum, driving means including a clutch winding and a brake winding adapted for alternative energization for starting the drum or for stopping it, a cam rotating with said drum, two cyclically operating normally closed cam switches actuated by said cam for sequential operation, said cam switches being angularly spaced from each other, a power source, a first circuit including said power source, a first selector switch, and said windings, said windings being connect. ed in parallel with each other and in series with said first selector switch, said first selector switch being biased toward said brake winding and away from said clutch winding, a relay coil for actuating, when energized, said first selector switch so as to de-energize said brake winding and to energize said clutch winding, a second circuit includin said power source, a second selector switch, said two cam switches, a normally open relay switch operated by said relay coil, and said relay coil, said cam switches being connected in parallel with each other and in series circuit with said power source, said second selector switch, said relay switch, and said relay coil, whereby the circuit through said relay coil will be opened by the opening of one or the other of said cyclically operating cam switches, depending upon the position of said second selector switch, in order that said brake winding may be energized to stop said drum in one or the other of two positions corresponding to the positions represented by the spacing of said cam switches about said cam, and a shunt circuit containing a control switch extending between said relay coil and said power source, and being shunted around said second selector switch, said cam switches and said relay switch, for initially energizing said relay coil and said second circuit and said clutch winding, to initiate the rotation of said drum and cam.

CARL A. LEVIN.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,993,413 Mellon Mar. 5, 1935 2,084,317 Brayer June 22, 1937 2,259,574 Lillquist Oct. 21, 1941 2,277,967 Gibson Mar. 31, 1942 2,350,703 Ryan et al. June 6, 1944 2,421,823 Allen et al. June 10, 1.947 2,423,028 Horton et al. June 24, 1947 2,471,505 Winther May 31, 1949 2,483,203 Janke Sept. 27, 1949 

